are right now fbi investigators in benghazi. i'm doug mcelway live in washington for hour number two of america's news headquarters. our chief intelligence correspondent catherine herridge has been working her sources on emerging details. tell it us what you learned? >> it it was reported two days after the attack in benghazi there is evidence suggesting insider help and this morning on the sunday talk shows the head of the house intelligence committee saying the terrorists seemed to know more of the consultate's layout. >> they may have known the ambassador was there or in the area. 9/11 is probably moreto that ee a.m. bass tore. >> the security libyan forces melted away after the attack unfolded and an intelligence source on the ground in libya tells fox 100 militants attacked the consultate and the 17th bra grad brigade was no we where to be found. the evidence points to a joint operation between al-qaeda affiliate in north africa and with ansar al-sharia. they are not directly affiliated with al-qaeda but aah sports the esta